CN210167485U - Multifunctional polarization converter based on solid plasma surface - Google Patents
Multifunctional polarization converter based on solid plasma surface Download PDFInfo
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Abstract
The utility model discloses a multi-functional polarization converter based on solid-state plasma surface, this polarization converter top-down include the solid-state plasma resonance structure of top layer, arrange the metal reflecting plate of the dielectric layer in the middle of and bottom in. The solid plasma has tunable characteristics, and when a resonance unit formed by the solid plasma is not excited, namely in an unexcited state, the resonance unit shows dielectric characteristics; when excited, the resonant unit formed by the solid plasma is in an excited state and shows a metal characteristic. The utility model discloses an excitation state of programming control surface solid state plasma resonance structure to the conversion (cross polarization conversion and line-circular polarization conversion) and the tunable purpose of frequency band of realization function. The utility model has the characteristics of the design is nimble, and the practicality is strong, and the tunability is strong and functional strong etc.
Description
Technical Field
The utility model relates to a multi-functional polarization converter, specific multi-functional polarization converter based on solid-state plasma surface that says so belongs to solid-state plasma practical technique and microwave device technical field.
Background
An artificial electromagnetic surface, also known as a metamaterial, generally refers to a periodic arrangement of sub-wavelength structures having physical properties not possessed by natural materials. The current research directions mainly include frequency selective surfaces, wave absorbers, high-impedance surfaces, surface plasmons, artificial magnetic conductors, polarization conversion super-surfaces, and the like. In recent years, broadband linear polarization-circular polarization conversion super-surfaces have been reported in large numbers, and relatively few broadband linear polarization-circular polarization conversion super-surfaces are reported.
The ubiquitous presence of plasma as an independent species form in space is the fourth form (or plasma) after the solid, liquid and gaseous states of a species form change. By changing the plasma concentration and the collision frequency, even by the selective plasma area, the multifunctional tuning of the polarization converter can be realized, namely, the 'one-machine-multiple-use' of the polarization converter can be realized.
The solid plasma is realized by an array composed of PIN units, and the PIN unit array is controlled and excited by a programmable logic array loaded at two ends of the PIN unit array so as to obtain the solid plasma. When the resonance unit formed by the solid plasma is not excited, namely in an unexcited state, the resonance unit shows dielectric characteristics; when excited, the resonant unit formed by the solid plasma is in an excited state and shows a metal characteristic.
The polar modulation super surface has attracted wide attention of domestic and foreign scholars by virtue of its excellent characteristics such as ultra-thin thickness and low loss. Polarization modulation is achieved by different phase shifts in the two orthogonal directions of the super-surface unit structure when electromagnetic waves are incident. Ma et al designs an ultrathin broadband super-surface by adopting an orthogonal I-shaped unit, and can realize linear polarization rotation and linear-circular polarization conversion; the subject group also adopts a double V-shaped unit to design a super surface for realizing the ultra-wideband high-efficiency linear polarization rotation function. Li and the like design double-layer transmission type line circular polarization conversion super surfaces, and can realize ultra wide band and high-efficiency work; meanwhile, the document realizes the singular reflection of the linearly polarized rotated broadband PGM using the double circular arc shaped cells.
It can be seen that most of the polar modulation super surfaces reported at present only possess single polar modulation function, so the utility model discloses will combine the advantage of solid-state plasma tunability, design a section and both can realize the conversion of function between cross polarization conversion and the line-circular polarization conversion, can realize again that the frequency band under cross polarization conversion state is tunable based on the multi-functional polar converter on solid-state plasma surface.
Disclosure of Invention
The utility model aims to solve the technical problem that, overcome prior art not enough, and provide a multi-functional polarization converter based on solid-state plasma surface, through the excitation state of programming control surface solid-state plasma resonance structure to realize the conversion of function and the tunable purpose of frequency band between cross polarization conversion and the line-circular polarization conversion, and can make the frequency band of line-circular polarization conversion reach 6.121-9.5GHz through reasonable parameter optimization, the total frequency band of cross polarization conversion reaches 4.62-10.34 GHz. When the cross polarization is switched, the transfer of the working frequency band between 4.62-8.34GHz and 7.92-10.34GHz can be realized, so that the purpose of frequency band tuning can be achieved.
The utility model discloses a solve above-mentioned problem and adopt following technical scheme:
according to the utility model provides a multi-functional polarization converter based on solid-state plasma surface, polarization converter top-down include the resonance unit that top layer solid-state plasma constitutes, middle dielectric layer and bottom metal reflecting plate can realize the conversion of function between cross polarization conversion and the line-circular polarization conversion and the purpose of the band tunable under cross polarization conversion state.
The invention relates to a further optimized scheme of a multifunctional polarization converter based on the surface of solid plasma, which comprises a top layer resonance unit, a middle dielectric layer and a bottom layer metal reflecting plate which are sequentially stacked from top to bottom and are composed of solid plasma, the top layer resonance unit consists of five parts, and comprises a cross-shaped resonance structure which is arranged along the central line of the medium layer and consists of two large L-shaped resonance structures, two end points of the two large L-shaped resonance structures are respectively connected with two outer arc resonance structures to form two fan-shaped structures with opposite circular corners and overlapped circular angles, two inner arc resonance structures are respectively arranged in the fan-shaped structures, small L-shaped resonance structures opposite to the large L-shaped resonance structures in direction are respectively arranged on two sides of the fan-shaped structures, and inclined rectangular resonance structures are respectively arranged at openings of the small L-shaped resonance structures.
As a further optimization scheme of the multifunctional polarization converter based on the surface of the solid-state plasma, the whole structure of the top layer resonance unit is symmetrical along two diagonal lines of the dielectric layer.
As a further optimized solution of the multifunctional polarization converter based on solid-state plasma surface according to the present invention, the large L-shaped resonant structure is formed by two rectangles with length a being 6.8mm and width b being 1mm, wherein the overlapping portion between the two large L-shaped resonant units is a square with length n being 0.2 mm.
In a further preferred embodiment of the multifunctional polarization converter based on the surface of solid-state plasma according to the present invention, the small L-shaped solid-state plasma resonance units are respectively formed by two rectangles with a length L of 4mm and a width c of 0.5mm, and the distances between the boundary x and the y axes of the small L-shaped solid-state plasma resonance units are both m of 1 mm.
As a further optimization scheme of the multifunctional polarization converter based on the surface of the solid-state plasma, the outer circular arc resonance structures are respectively composed of a quarter circular arc with the width w of 1.5mm, and the outer boundary is tangent to the large L-shaped resonance structure; the two inner arc resonance structures are respectively formed by a width w11.5mm quarter of a circular arc, the distance z between the inner and outer circular arcs1＝4mm。
As a further optimized solution of the multifunctional polarization converter based on the solid-state plasma surface, the length f of the tilted rectangular resonance structure is 5mm, the width g is 0.7mm, and the tilted rectangular resonance structure is symmetrical along a 45 ° diagonal; and the distances from the central point of one side edge of the inclined rectangular resonance structure close to the center to the x axis and the y axis are both 5 mm.
In a further preferred embodiment of the multifunctional polarization converter based on the solid-state plasma surface according to the present invention, the intermediate dielectric layer is made of a dielectric substrate, the material of the intermediate dielectric layer is F4B, the dielectric constant is 2.2, the loss tangent value is 0.0002, the side length of the dielectric substrate, i.e., the unit period p, is 20mm, and the thickness h is 6.4mm, and the dielectric substrate is disposed above the bottom metal reflective plate.
In a further preferred embodiment of the multifunctional polarization converter based on the surface of the solid-state plasma, the bottom metal reflector plate is made of copper, and has a thickness t equal to 0.03 mm.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the utility model discloses a multi-functional polarization converter based on solid-state plasma surface controls the excitation state of the resonance unit that solid-state plasma constitutes through outside logic array programming to realize the function of polarization converter switches between cross polarization conversion (4.62-10.34GHz) and line-circular polarization conversion (6.12-9.50GHz), simultaneously, when cross polarization conversion state, also can realize the transfer of operating frequency band between 4.62-8.34GHz and 7.92-10.34 GHz.
(2) The utility model has the characteristics of the regulation and control means is various, the design is nimble, functional strong, the practicality is strong etc.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a schematic diagram of the unit structure of state one of the present invention.
Fig. 3 is a schematic diagram of the unit structure of the second state of the present invention.
Fig. 4 is a schematic diagram of the unit structure of state three of the present invention.
Fig. 5 is a perspective view of the present invention.
Fig. 6 is a side view of the present invention.
Fig. 7 is a (3 × 3) array diagram of the present invention in which the structural units are periodically arranged.
Fig. 8 is a graph of the reflection polarization conversion ratio at normal incidence of electromagnetic waves (electric field along x-axis) according to the present invention.
Fig. 9 is a graph of the reflection amplitude at normal incidence of electromagnetic waves (electric field along the x-axis) for the present invention.
Fig. 10 is a graph of the phase of the reflection at normal incidence of the electromagnetic wave (electric field along the x-axis) according to the present invention.
Fig. 11 is a graph of the state of the invention, axial ratio, at normal incidence of the electromagnetic wave (electric field along the x-axis).
Fig. 12 is a graph of the reflection amplitude of the second state of the present invention when the electromagnetic wave is incident perpendicularly (the electric field is along the x-axis).
Fig. 13 is a graph of the reflection amplitude of the electromagnetic wave at normal incidence (electric field along x-axis) in state three of the present invention.
Fig. 14 is a graph of the reflection polarization conversion rate of the electromagnetic wave at normal incidence (electric field along x-axis) in the second and third states of the present invention.
Fig. 15 is a graph showing the reflection amplitude curves of the incident electromagnetic wave along the u-axis and the v-axis, respectively, according to the second embodiment of the present invention.
Fig. 16 is a phase diagram of the incident electromagnetic wave along the u-axis and the v-axis, respectively, according to the second embodiment of the present invention.
Fig. 17 is a graph showing the reflection amplitude curves of the incident electromagnetic wave along the u-axis and the v-axis, respectively, in the third state of the present invention.
Fig. 18 is a phase diagram of the incident electromagnetic wave along the u-axis and the v-axis, respectively, according to state three of the present invention.
The reference signs explain: 1-big cross-shaped resonance unit, 2, 3-outer circular arc resonance structure, 4, 5-inner circular arc resonance structure, 6, 7-small L-shaped resonance unit, 8, 9-oblique rectangular resonance structure, 10-middle medium layer, 11-bottom layer metal reflecting plate, 12, 13, 14, 15, 16, 17, 18, 19, 20-solid plasma excitation source.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiments as follows:
the embodiment provides a multifunctional polarization converter based on a solid plasma surface, which is formed by periodically arranging unit structures and has the following three states: the structural unit of the state I comprises a bottom layer metal reflecting plate 11, a middle medium layer 10 and an excited large cross-shaped solid plasma resonance unit 1, as shown in figure 2; the structural units of the state II comprise a bottom layer metal reflecting plate 11, a middle medium layer 10, an excited large cross-shaped solid plasma resonance unit 1, outer arc solid plasma resonance units 2 and 3, small L-shaped solid plasma resonance units 6 and 7 and obliquely-arranged rectangular solid plasma resonance units 8 and 9, as shown in FIG. 3; the structural unit of the third state comprises a bottom metal reflecting plate 11, a middle dielectric layer 10, an excited large cross-shaped solid plasma resonance unit 1, inner arc solid plasma resonance units 4 and 5, small L-shaped solid plasma resonance units 6 and 7 and inclined rectangular solid plasma resonance units 8 and 9, as shown in FIG. 4. Through the excitation state of regulation and control solid state plasma resonance unit, the utility model discloses the conversion of function (cross polarization conversion and line-circular polarization conversion) and the tunable of frequency band have been realized.
The polarization transformer, when programmed, can be switched between state one, state two and state three. And bias voltage is loaded at two ends of the solid plasma resonance unit for excitation, so that the conversion between the metal characteristic and the medium characteristic is realized. When the solid plasma resonance unit is not excited, the solid plasma resonance unit shows dielectric characteristics, namely, the solid plasma resonance unit is in an unexcited state; when excited, the material shows metal characteristics, namely, an excited state. The polarization converter selection Drude model describes the dielectric constant of solid-state plasma, where the plasma frequency is 2.9 x 1015rad/s with a collision frequency of 1.65X 10111/S. The solid-state plasmon resonance units 1, 2, 3, 4, 5, 6, 7, 8, 9 are excited by solid-state plasmon excitation sources 12, 14, 13, 16, 15, 17, 18, 19, 20, respectively, as shown in fig. 5. The on-off state of the solid plasma excitation source is controlled by programming respectively.
The surface copper patch material of the polarization converter is copper, the dielectric layer material is F4B, the dielectric constant is 2.2, and the loss tangent is 0.0002.
The relevant parameters of the polarization converter are shown in table 1, and the specific parameter identifiers are shown in fig. 1.
| Parameter(s) | p | a | b | w | w1 |
| Value (mm) | 20 | 6.8 | 1 | 1.5 | 1.5 |
| Parameter(s) | c | l | h | t | s |
| Value (mm) | 0.5 | 4 | 6.4 | 0.03 | 5 |
| Parameter(s) | n | m | z1 | g | f |
| Value (mm) | 0.2 | 1 | 4 | 0.7 | 5 |
TABLE 1
Fig. 5 is a perspective view of the polarization transformer, fig. 6 is a side view of the polarization transformer, and fig. 7 is a (3 × 3) array diagram in which the polarization transformer structural units are periodically arranged.
The utility model discloses a production method of multi-functional polarization converter based on solid-state plasma surface, polarization converter when electromagnetic wave vertical incidence (electric field along x axle direction), under the combined action of surface solid-state plasma resonance unit and bottom metal reflecting plate, can take place polarization conversion. When different parts of the solid-state plasma resonance units are excited, different polarization conversion effects can be generated, and the different polarization conversion effects are respectively reflected in different types of polarization conversion and different working frequency bands of the polarization conversion.
The solid plasma resonance unit 1 in a big cross shape in the first state is excited and shows a metal characteristic, and the rest resonance units 2, 3, 4, 5, 6, 7, 8 and 9 which are not excited show a medium characteristic, as shown in fig. 2, and the generated effect is calculated by simulation software and is shown in fig. 8, 9, 10 and 11. By conversion of polarisationRate equation PCRR＝r2 yx/(r2 yx+r2 xx+t2 yx+t2 xx)，PCRRRepresenting the conversion of reflected polarization, ryxDenotes the cross-polarization reflection coefficient, rxxDenotes the co-polarized reflection coefficient, tyxDenotes the cross-polarization transmission coefficient, txxShows the co-polarization transmission coefficient, t is the complete metal reflecting plate at the bottom layeryx＝t xx0, so when PCRR0.5, the phase difference of the orthogonally reflected polarized waves is
(or an odd multiple thereof) and the cross polarization reflection coefficient and the same polarization reflection coefficient have equal amplitudes, indicating that complete linear-circular polarization conversion occurs.
FIG. 8 is a graph of the reflected polarization conversion ratio of the polarization transformer state one at normal incidence of the electromagnetic wave (electric field along the x-axis), and in FIG. 8, the PCR of the polarization transformer state one is maintained at about 0.5 in the operating band of 6.12-9.50 GHz. FIG. 9 is a graph of the reflection amplitude of the polarization transformer state-when the electromagnetic wave is incident normally (electric field along the x-axis), as shown in FIG. 9, r of the polarization transformeryxAnd rxxSubstantially equal in the operating band of 6.12-9.50 GHz. Fig. 10 is a graph showing the state of the polarization transformer, a reflection phase at normal incidence of the electromagnetic wave (electric field along x-axis), and fig. 10 shows that the phase difference of the orthogonally reflected polarized waves of the polarization transformer in the state is substantially ± 90 ° within the operating band of 6.12-9.50 GHz. Engineering defines that a wave is considered to be circularly polarized when the polarization axis ratio is less than 3 dB. FIG. 11 is a graph of the polarization transformer state-axial ratio at normal incidence of the electromagnetic wave (electric field along the x-axis), and FIG. 11 shows that the reflected polarization axial ratio is less than 3dB in the operating band of 6.12-9.50 GHz. Therefore, in summary, the polarization converter generates linear-circular polarization conversion in a state that the working frequency band is 6.12-9.50GHz, the frequency bandwidth is 3.38GHz, and the relative bandwidth is 43.3%.
The second state is the inner arc resonance structure 4 formed by two solid plasmas,5 are not excited and the remaining solid state plasmon resonance units 1, 2, 3, 6, 7, 8, 9 are all excited as shown in fig. 3. The third state is that the outer arc resonant structures 2 and 3 formed by the two solid plasmas are not excited, and the rest solid plasma resonant units 1, 4, 5, 6, 7, 8, 9 and 10 are all excited, as shown in fig. 4. The definition of cross-polarization transformation indicates that PCR is performed>0.9 and the orthogonally reflected polarized waves have a phase difference of
Satisfying both conditions may be considered to be the occurrence of a complete linear cross-polarization transformation.
FIGS. 12 and 13 are graphs showing the reflection amplitude of the second and third states of the polarization converter when the electromagnetic wave is incident perpendicularly (the electric field is along the x-axis), respectively, and the graphs show the polarization converter in the operating frequency band r of the two statesxxIs close to 0 and ryxClose to 1. Fig. 14 is a graph of the reflection polarization conversion rate of the second and third states of the polarization converter at normal incidence of electromagnetic waves (the electric field is along the x-axis), and the graph shows that the operating frequency band of the polarization converter in the second state is 4.62-8.34GHz and the operating frequency band of the polarization converter in the third state is 7.92-10.34GHz, and the overlapping portion of the two operating frequency bands is only 0.42 GHz, thereby better realizing the tunability of the frequency bands. FIGS. 15 and 17 are graphs of the reflection amplitudes of the incident electromagnetic wave in the second and third states of the polarization transformer along the u-axis and the v-axis, respectively, where r isuuRepresenting a curve of the amplitude of reflection incident along the u-axis and exiting along the u-axis, ruuRepresenting a curve of the reflection amplitude incident along the v-axis and exiting along the v-axis. FIGS. 15 and 17 both show that r is within the 4.62-8.34GHz operating band in State two and the 7.92-10.34GHz operating band in State threeuuAnd rvvSubstantially coincident. Fig. 16 and 18 illustrate phase curves of the polarization transformer in state two and state three along the u-axis and v-axis, respectively, for an incident electromagnetic wave, wherein,
representing the reflected phase curve incident along the u-axis and exiting along the u-axis,
representing the reflected phase curve incident along the v-axis and exiting along the v-axis. Fig. 16 and 18 both show that the phase retardation of the polarization transformer is about 180 ° in the respective operating bands of state two and state three, which means that the polarization transformer has cross polarization transformation capability in the respective operating bands. In summary, the cross polarization switching can be realized in both the second state and the third state, the operating frequency band in the second state is 4.62-8.34GHz, the frequency bandwidth is 3.72GHz, and the relative bandwidth is 57.4%; the working frequency band of the state three is 7.92-10.34GHz, the frequency bandwidth is 2.42GHz, and the relative bandwidth is 25.6%. The total frequency band of the cross-polarization switching spans 4.62-10.34 GHz.
The utility model discloses an excitation state of programming control surface solid state plasma resonance structure to realize the conversion of function between cross polarization conversion and the line-circular polarization conversion (realize line-circular polarization conversion in 6.121-9.5GHz frequency channel, realize cross polarization conversion in 4.62-10.34GHz frequency channel) and the band tunable (realize the transfer between 4.62-8.34GHz and 7.92-10.34GHz two frequency channels) under cross polarization conversion state purpose. The utility model has the characteristics of the design is nimble, and the practicality is strong, and the tunability is strong and functional strong etc.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (8)
1. A multifunctional polarization converter based on a solid state plasma surface, characterized in that: the plasma resonance structure comprises a top layer resonance unit, a middle medium layer and a bottom layer metal reflecting plate which are sequentially stacked from top to bottom and are composed of solid plasmas, wherein the top layer resonance unit is composed of five parts and comprises a cross-shaped resonance structure which is arranged along the central line of the medium layer and is composed of two large L-shaped resonance structures, two outer arc resonance structures are respectively connected to two end points of the two large L-shaped resonance structures to form two fan-shaped structures, two circular corners of the fan-shaped structures are opposite to each other and are overlapped, two inner arc resonance structures are respectively arranged in the fan-shaped structures, small L-shaped resonance structures opposite to the large L-shaped resonance structures in direction are respectively placed on two sides of each fan-shaped structure, and inclined rectangular resonance structures are respectively arranged at openings of the.
2. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the integral structure of the top layer resonance unit is symmetrical along two diagonal lines of the dielectric layer.
3. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the large L-shaped resonant structure is formed by two rectangles with the length a being 6.8mm and the width b being 1mm, wherein the overlapping part between the two large L-shaped resonant units is a square with the length n being 0.2 mm.
4. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the small L-shaped solid plasma resonance unit is respectively composed of two rectangles with the length L being 4mm and the width c being 0.5mm, and the distance between the boundary x and the y axes of the small L-shaped solid plasma resonance unit is m being 1 mm.
5. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the outer arc resonance structures are respectively composed of a quarter arc with the width w equal to 1.5mm, and the outer boundary is tangent to the large L-shaped resonance structure; the two inner arc resonance structures are respectively formed by a width w11.5mm quarter of a circular arc, the distance z between the inner and outer circular arcs1＝4mm。
6. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the length f of the inclined rectangular resonance structure is 5mm, the width g of the inclined rectangular resonance structure is 0.7mm, and the inclined rectangular resonance structure is symmetrical along an inclined diagonal line of 45 degrees; and the distances from the central point of one side edge of the inclined rectangular resonance structure close to the center to the x axis and the y axis are both 5 mm.
7. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the intermediate medium layer is composed of a medium substrate, the material of the intermediate medium layer is F4B, the dielectric constant is 2.2, the loss tangent value is 0.0002, the side length of the medium substrate, namely the unit period p is 20mm, the thickness h is 6.4mm, and the medium substrate is arranged above the bottom layer metal reflecting plate.
8. The solid state plasma surface based multifunctional polarization converter of claim 1, wherein: the bottom layer metal reflecting plate is made of copper, and the thickness t is 0.03 mm.
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| CN113346254A (en) * | 2021-06-01 | 2021-09-03 | 金陵科技学院 | Polarization converter based on varactor active frequency selective surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113346254A (en) * | 2021-06-01 | 2021-09-03 | 金陵科技学院 | Polarization converter based on varactor active frequency selective surface |
| CN113346254B (en) * | 2021-06-01 | 2022-03-25 | 金陵科技学院 | Polarization converter based on varactor active frequency selective surface |
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